Recording instrument.



R. P. BROWN. RECORDING INSTRUMENT. APPLICATION HLBDAPEB. 4, 1909.

Paten'sed. Oct. 19, 1909.

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nnoonnme INSTRUMENT.

Speccationof Letters Patent.

Application filed February 4, 1909. Serial No. 475,95i.

To all whom 'it may concern.:

Be it known that I, RICHARD P. BROWN, a eitizenof the United States, and a resident of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Recording Instruments, of which the following is a specilication. y

My invention relates to improvements in recording instruments and more particularly to improvements in that classy of instruments, pyrometers for example, in which a record is made upon a moving chart by a pen or stylus which is actuated by a milli volt meter or other instrument. In instruments of this character the pen or stylus carrying arm is usually a very delicate member the maintenance of the proper adjustment of which is absolutely essential for accuracy and it is ver desirable that it.should not be handled by unskilled or careless persons who might disarrange this. The charts upon which the record is traced are usually of paper which are revolved by clock-Work around their centers and in contact with the vpen or stylus and at certain fixed intervals the c: arts are renewed. ln order to .reuen the charts it 'is the usual practice to litt the stylus or pen carrying arm out of the way; this is veryy apt to result 1n changing the adjustment of the arm and one objectof my inchart may be removed and replaced without 1n any ivay disturbing or touching' said arm. l carry the charts, 1n the instrument, upon a chart holder which is rotated by clockwork, in the usual-manner, and, in addition. is moved at intervals into and out of contact with the stylus or pen by mechanism driven by the clock-work, the purpose ot' this being to permita tree inovcmei'it ot the pen or stylus carrying airn. ln some instruments the arm actuating means Vis so delicate that it cannot operate when the pen or stylus is in contact with the chart. In my apparatus the chart lies at all timeaY per- 'lectly flat and the stylus can contact it praetically from its center to itsperiphery.

The chart holder and chart have some `little weight notwithstanding that their construction is very light. and in order to counteractI this andf'malie the work upon the.

provided my instrument with a device for engaging the stylus carrying arm when the chart is withdrawn. This device holds the arm steadily during the process oi cleaning or inking the stylus or pen.

In the accompanying drawings forming part ot' this specification and in which similar numerals ot' reference indicate similar parts throughout the several views z-Figure '1, shoivs a plan view, partly broken away of an electric recording pyrometer constructed according to my invention; Fig. 2, a section of Fig-l on line X-X; Fig. 3, a section of Fig. l, upon an enlarged scale, upon line z/-vw 4, a plan ol the toothed side of the driven wheel tor elevating the chart holder; Fig. 5, a. plan of the toothed Wheel for driving the wheel shown in Fig. d; Fio'. 6,- a section of Fig. 2 on line Z-Z; Fig. 7, a plan of part of the case of the instrument showing the slide, carrying the chart and resented oet. is, ieee.:

connected parts, partly drawn out; Fig. 8, a

section oit' Fig. 7 on line Vif-W.

t, Q, are the magnets of a milli volt meter or otherinstrument, and 2 the stylus or pen carrying arm. 3 is the pen or stylus, the chart. upon which record is made; all of these parts are of the usual construction and will not require detailed description.

The pen or stylus is adapted tx) contact with and to trace upon the chart 4: a line vention is to furnish a means whereby the which, they Chrt being properly 'dwlded forms a record of the movements of the in strument. The chart and connected parts are-carried upon slide 5, which for convene -ience l have shown as 'forming the bottom' ot' a drawer 6 the sides o which are carried by inclined guides 7 formed upon the sides (s oi" the box inclosing the instrument.

When it is necessary to remove the chart d the slide is drawn out and by the inclination downward ot the carrying guides 7, the downward movement moves the chart away from the pen or stylus which is thereby not atl'ected or moved in any i ay by this movement ot' the chart, irtter the chart nolder has been moved away from the arm 2, as shown in Figs. 7 and 8, the chart may be. removed, a newI one placed in it and the parts returned to their original positions without disturbing the arm or marling the chart by drawing it. out in Contact with the pen or stylus 3.

9 is the chart holder which is preferably formed of metal and carried on a support 10 which is carried by a crown-wheel 1l.

Mie Weight of said www ieventing a rota-ry movement ofseifi arms and Wheel, springs for partially' supporting Wheel and superposed parte, a diivng crowlbwheelihe ?teeth of which are in engagement with' the teeth of said first crown-Wheel, ineens' for driving said dfiving crWn-Wheel, 51nd means for rotating said chart holder.

'7'. In an apparatus of the character de; scribed', in Combination, a stylus or pen ear; iyinff afin alici means for operating the same, e sii e, a chai-t carrying and actuating means carried by said slide, and 'a rest operatedl by vim owerd movement of said slide to enis4 gage and by en inward movement of said.

slide todisen'gage seid stylus or pen 'carrying arm.

8. In an aperetus nf the eharaeter de;

scribed, in cern ination, a stylusor pen earryin amm and means'for o 1 sli e, achertarrying an carried by said slide, slide, and a pivotaliy Supporte@ iest adapted to be operated by the 'movements Lof said slide and stopvto cause said rst tox engage and dsengage said arm.

' RICHARD P. BROWN. Witnesses:

FRED.'E. V.- SAPPINGTON, y CHARLEs A. BUTTER.

epating the same, y 'actuating meens a stopcwpiied by said 

